Dyeing acetyl cellulose or fabrics containing the same and new products for use therein



Patented Apr. 21, 1925.

entree stares JAMES BADDILEY, ARNOLD snnrnmnson, HERBERT swarm, JAMES Hm, .an'n LESLIE eoRnonLAwRIE, ou MANCHESTER, nnenann, AssIeNpRs 'ro BRITISH DYES'I'UFFS CORPORATION LIMITED, or MAncnEs'rnR, ENGLAND.

DYEING AGE'IYL OELLULOSE OR FABRICS CONTAINING THE SAME AND NEW PRODUCTS FOR USE THEREIN.

No Drawing.

one chloride and one acid with or without.

phed addition of one or more protective .001-

Another method of dyeing cellulose triacetate has been proposed, comprising the use of colloidal solutions of (1 es or dye compounds prepared by the addltion to the said solution of certain precipitants in the presence of protective colloids.

In our earlier British application for Letters Patent No. 211720 we have described the dyeing of acetyl silk with amino-anthraquinones in which process the addition of an emulsifying agent or protective c0l-' loid, for example, soap, Turkey red oil, etc., has been found to be advantageous.

We have now found that in dyeing acetyl silk, of all the protective colloids or dispersing agents available, the condensation products of naphthalene with formaldeh de in sulphuric acid solution or naphtha 'ne sulpho acids with formaldehyde give the best results and enable new products, suited for dyeing acetyl silk with the greatest simplicity, to be placed at the dyers dis osal as hereinafter described. The said nap thalene formaldehyde sulphuric acid condensation products can be prepared as described in British Letters Patent Nos. 4648/11 or 7137/13 but we give below an example of the method which we prefer to adopt. a

The new roductsreferred to are obtained by thoroug y mixing together suitable colouring matters havin aflinit for acetyl silk, and which are su antially sulphuric acid condensation products and the requisite quantity of water. The prodinsoluble, with the said naphthalene formaldehyde Application filed October 9, 1924. Serial No. 742,703.

ucts obtained may be termed pastes and behave in the dyebath exactl as if the dyestuif were dissolved in the hath so that the dyer of the acetyl cellulose fibre does not re quire to take any special precautionsand a wide range of colours can be obtained without it being necessary to diazotize and develop on the fibre. If desired-these pastes can be dried by evaporation and ground to powder so that the products are available in powder form which are frequently preferred by dyers. These mixed with direct cotton yestufis and the mixtures for dyeing materials consisting partly of acetyl silk and partly of ordinary Vegetable fibre.

The following examples illustrate the manner in which we prefer to manufacture the dispersing agent and to prepare the new products and dye according to the new process. 4

Example I.

1 part of naphthalene is sulphonated with owders can be 1 part of sulghuric monohydrate for 10 hours at 160 ing. Ata temperature of -85 C., 0.3 parts 40% formaldehyde are added and condensation carried on for 6 hours at 95 100 C. After cooling, dilute with 0.6 parts of water and partially neutralize with 0.6 parts 38% caustic soda solution.

Example I].

The dyestufi paste is made up as fol- As an illustration of its application, take, say, 10 pounds of the product obtained as described in Example 11 for 100 pounds of The resulting product is diluted with 0.4 parts of water with cool:

acetyl yarn. Add the dyestufi dispersion mixture to the cold dyebath and after mixing well, enter the yarn, previously wetted out. -W0rk well and raise the temperature adually to 7080 (1.; salt may be added if desired. Rinse and dry the yarn. It is dyed a bright full yellowish-red shade -hav-:

- clear, the mixture may be poured directly into a dyebath, using, say, the equivalent of one part of the aminoanthraquinone per 100 parts of acetyl silk yarn. The silk is dyed a full bright reddish-violet shade and the dyebath is practically completely exhausted. v

We claim 1. The improvement in dyeing acetyl silk which consists in intimately mixing substantially insoluble colouring matters, which have aflinity for acetyl silk with a naphtha;

Lea-gem lene formaldehyde sulfuric acid condensation roduct and dyeing with this mixture.

maldehyde sulfuric acidcondensation prodnot having aflinity for acetyl silk, all substantially as described.

3. The manufacture of new products for dyeing acetyl silk by intimately mixing substantially insoluble colourin matters having aiiinitylfor acetyl silk with a naphthalene formaldehyde sulfuric acid condensation product. 1

4. As new articles of manufacture the mixture of substantially insoluble colouring matters having aflinit for acetyl silk with a naphthalene form dehyde sulfuric acid condensation roduct either in paste form or as dry pow er. I

In testimony whereof; we have hereunto aflixed our signatures.

JAMES BADDILEY. 'ARNOLD SHEPHERDSON.

HERBERT SWAN N.

JAMES HILL. 7 LESLIE GORDON LAWRIE. 

